# Stretching a spring analysis (F=ke)

I can describe and calculate the properties of a spring using Hooke’s law.

# Stretching a spring analysis (F=ke)

I can describe and calculate the properties of a spring using Hooke’s law.

## Lesson details

### Key learning points

- A spring is elastically deformed if it returns to its original shape after the applied force is removed
- A spring is inelastically deformed if it does not return to its original shape after the applied force is removed
- Elastic deformation is proportional to the force applied to stretch or compress a spring
- The spring constant (k) is the force needed to extend or compress an elastic object by one metre
- Force on a spring = spring constant × extension

### Common misconception

Pupils often think the bigger the spring constant, the more a spring stretches for a given force.

Provide opportunities for pupils to apply understanding that the spring constant describes the stiffness of a spring. The bigger the spring constant, the harder it is to stretch (or compress) the spring.

### Keywords

Directly proportional - A variable is directly proportional to another if it doubles or triples when the other one does the same.

Elastic deformation - The stretch of a spring that returns to its original shape when the stretching force is removed.

Inelastic deformation - The stretch of a spring as it is permanently stretched out of shape.

Spring constant - A measure of how stiff a spring is and how hard it is to stretch or compress.

Hooke’s Law - For elastic deformations, extension (or compression) is directly proportional to the force applied.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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